Finding the Fourth Proportional to 21,429.39, 29,570.95 and 12,348.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,429.39 : 29,570.95 = 12,348.30 : x
2. Step 2: Convert to fraction form
   21,429.39/29,570.95 = 12,348.30/x
3. Step 3: Cross multiply
   21,429.39x = 29,570.95 × 12,348.30
4. Step 4: Simplify right side
   21,429.39x = 365,150,961.89
5. Step 5: Solve for x
   x = 365,150,961.89/21,429.39
6. Step 6: Final answer
   x = 17,039.73